UI Controls Silverlight

    xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' 
    xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
    xmlns:d='http://schemas.microsoft.com/expression/blend/2008' 
    xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006' 
    mc:Ignorable='d'
    xmlns:basics='clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls'     
     
    d:DesignWidth='640' 
    d:DesignHeight='480'>
    
  
        
    
    
    
    
  


//File: Page.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
namespace SilverlightApplication3
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }
        private void DatePicker_DateValidationError(object sender, DatePickerDateValidationErrorEventArgs e)
        {
            lblError.Text = "'" + e.Text + "' is not a valid value because " + e.Exception.Message;            
        }
        private void Calendar_SelectedDatesChanged(object sender, SelectionChangedEventArgs e)
        {            
            foreach (DateTime selectedDate in e.AddedItems)
            {
                if ((selectedDate.DayOfWeek == DayOfWeek.Saturday) ||
                    (selectedDate.DayOfWeek == DayOfWeek.Sunday))
                {
                    lblError.Text = "Weekends are not allowed";
                    ((Calendar)sender).SelectedDates.Remove(selectedDate);
                }
            }
        }
    }
}